SA401 - Registering a partner for Self Assessment and Class 2 NICs
You can send this form online, instead of downloading the form, it's quicker and easier.
Follow the link below.
- Form URL
- SA401 (PDF, 98KB)
Form for an individual to register as a partner for Self Assessment and Class 2 NICs.
You can complete the form on screen, print it, and post it to HM Revenue and Customs (HMRC).
If you have problems opening the form, find help by following the link below 'Get help viewing PDFs' or use this version of SA401. You'll have to print this version and fill it in by hand.
- Use this form to register for Self Assessment if you've joined a partnership. It will help get your tax and National Insurance right from the start
64-8 - Authorising your agent
Use form 64-8 to authorise HMRC to communicate with your tax representative about your tax affairs
SA400 - Registering a partnership for Self Assessment
Use this form if you need to register a new partnership for Self Assessment
SA402 - Registering a partner for Self Assessment if they're not an individual
Use this form if you need to register a partner for Self Assessment that isn't an individual, for example if a company or trust has joined a partnership
CWF1 - Self Assessment and National Insurance contributions - Registration and / or low earnings
Use form CWF1 to register for Self Assessment if you can’t register for business taxes online. Complete the form on screen, then print and post it to HMRC.
SA1 - Registering for Self Assessment and getting a tax return
Registering for Self Assessment
Help with PDF files
PDF is a file format that lets you view and print a document in a style which matches the look and feel of the paper version - including fonts, colours, images and layout.
To view these documents you need to use a PDF viewer such as Adobe Reader.
Forms in alternative formats
If you would like an HMRC form in large print, Braille or another alternative format, please contact the relevant HMRC helpline - see the link below.